Isotropic cleansing composition with particulate optical modifiers

Abstract

An aqueous isotropic liquid cleansing and moisturizing composition is provided having a surfactant; a thickening agent, and a solid particulate optical modifier that modifies the appearance of the skin after wash off.

1. An isotropic liquid cleansing composition comprising:
 (a) about 1 to 35 wt. % of surfactant(s) selected from an anionic, nonionic, amphoteric or cationic surfactant or mixtures thereof; 
 (b) a thickening agent; 
 (c) about 0.1% to 10% of a cationic polymer; 
 (d) a solid particulate optical modifier in a concentration of at least about 0.2% by wt. for exhibiting a specific set of optical properties on skin characterized by one or more skin evaluation methods selected from Tile evaluation method, Hand wash (consumer evaluation) method, Hand wash (lab evaluation) method, or a set of Tristimulus Color Values L, a*, and b*; a reflectivity change, and an opacity change, that provides at least a 5% change in at least one of the specific optical properties when said cleansing composition is applied to skin and then rinsed off using the In-vitro Visual Assessment Protocol; 
 (e) wherein the viscosity of the isotropic cleansing composition is in the range of about 1,000 to 300,000 cps @ 1/sec shear rate at 25 C via the cone and plate method; 
 (f) less than 0.01% of a hydrophobic emollient; and 
 (g) wherein the solid particulate optical modifier is selected from organic pigments, inorganic pigments, platy substrate coated with organic and inorganic materials, or blends and physical aggregates thereof. 
 
     
     
       2. A composition according to  claim 1  wherein the visual attribute targeted by the optical modifier is selected from skin shine, skin color or skin optical uniformity, and combinations thereof. 
     
     
       3. The composition according to  claim 2  wherein the change in L value is in the range from about 0 to ±10, the reflectance change in the range from about 0 to ±300%, and the change in opacity in the range from about 0 to ±20% with the proviso that the change in L value, reflectance change and opacity change are not all zero so as to provide noticeable skin shine when said cleansing composition is applied to skin and then rinsed off using the In-vitro Visual Assessment Protocol. 
     
     
       4. The composition according to  claim 2  wherein the change in L value is in the range from about 0 to ±10 the change in the a* value is in the range from about 0 to ±10, a change in the b* value in the range from about 0 to ±10 the change in opacity in the range from about 0 to ±50%, and the reflectance change is within the normal skin reflectivity range of about ±10% with the proviso that the change in L value, b* and opacity change are not all zero so as to provide noticeable skin lightening or color change when said cleansing composition is applied to skin and then rinsed off using the In-vitro Visual Assessment Protocol. 
     
     
       5. The composition according to  claim 2  wherein the change in L value is in the range from about 0 to ±5, the reflectance change is in the range from about 0 to ±100%, the change in opacity is in the range from about 0 to ±50%, and the change in a* and b* are within normal skin color range of about ±10% for each of a* or b*, with the proviso that the change in L value, reflectance change and opacity change are not all zero so as to provide noticeable skin optical uniformity change when said cleansing composition is applied to skin and then rinsed off using the In-vitro Visual Assessment Protocol. 
     
     
       6. A composition according to  claim 1  wherein the cationic polymer has a charge density of at least about 0.7 Meq/g. 
     
     
       7. A composition according to  claim 1  wherein the composition contains an anionic surfactant and the ratio of anionic surfactant to a surfactant that has a positive charge at a pH of about 6.5 or below is in the range of about 15:1 to about 1:2. 
     
     
       8. A composition according to  claim 7  wherein the surfactant with the positive charge is an amphoteric surfactant. 
     
     
       9. A composition according to  claim 8  wherein the amphoteric surfactant is selected from betaine, alkylamidopropyl betaine, sulphobetaine, amphoacetate or blends thereof. 
     
     
       10. A composition according to  claim 1  further comprising greater than about 30% by weight water. 
     
     
       11. A composition according to  claim 1  wherein the viscosity of the cleansing composition is in the range of about 5,000 to about 50,000 cps. 
     
     
       12. A composition according to  claim 1  wherein the solid particulate optical modifier has an average diameter of at least about 30 microns. 
     
     
       13. A composition according to  claim 1  wherein the thickening agent is selected from polyacrylates; silica, natural and synthetic waxes; aluminum silicate; lanolin derivatives; C8 to C20 fatty alcohols polyethylene copolymers; polyammonium carboxylates; sucrose esters; hydrophobic clays; petrolatum; hydrotalcites; cellulose derivatives, polysaccharide derivatives, or derivatives and mixtures thereof. 
     
     
       14. A composition according to  claim 1  wherein the composition is structured with a structurant selected from swelling clays; cross-linked polyacrylates; acrylate homopolymers and copolymers; polyvinylpyrrolidone homopolymers and copolymers; polyethylene imines; inorganic salts; sucrose esters, gellants or blends and derivatives thereof. 
     
     
       15. A composition according to  claim 1  wherein less than about 50% by wt. of the solid particulate optical modifier is suspended in an oil. 
     
     
       16. A composition according to  claim 7 , wherein the anionic surfactant is selected from a C8–C16 alkyl sulfate and/or alkyl ether sulfates, fatty acid soaps, taurates, sulfosuccinates, glycinates, sarcosinates or derivatives or blends thereof. 
     
     
       17. A composition according to  claim 1  having at least about 7 wt % of the surfactant. 
     
     
       18. The composition according to  claim 1  wherein the particulate optical modifier possesses color generated through fluorescence, adsorption, iridescence or a combination thereof. 
     
     
       19. The composition according to  claim 3  wherein greater than about 10% by wt. of the particulate optical modifier is further defined by an exterior surface refractive index, geometry, and specific dimensions wherein:
 i) the exterior surface has a refractive index of about 1.8 to 4.0; 
 ii) the geometry is platy, cylindrical or a blend thereof; and 
 iii) the specific dimensions are about 10 to 200 um average diameter in the case of a platy particle, or about 10 to 200 um in average length and about 0.5 to 5.0 um in average diameter in the case of a cylindrical particle. 
 
     
     
       20. The composition according to  claim 4  wherein greater than about 10% by wt. of the particulate optical modifier is further defined by an exterior surface refractive index, geometry, and specific dimensions wherein:
 i) the exterior surface has a refractive index of about 1.3 to 4.0 
 ii) the geometry is spheroidal, platy or a blend thereof 
 iii) the specific dimensions are about 1 to 30 um average diameter in the case of a platy particle, or about 0.1 to 1 um in average diameter in the case of a spheroidal particle; and 
 iv) optionally having fluorescence color, absorption color, interference color or a combination thereof. 
 
     
     
       21. The composition according to  claim 5  wherein greater than about 10% by wt. of the particulate optical modifier is further defined by an exterior surface refractive index, geometry, and specific dimensions wherein:
 i) the exterior surface has a refractive index of about 1.3 to 2.0 
 ii) the geometry is spheroidal, platy, cylindrical or a blend thereof 
 iii) the specific dimensions are about 0.1 to 200 um in average diameter in the case of a spheroidal particle, about 1 to 10 um average diameter in the case of a platy particle, or about 1 to 10 um in average length and about 0.5 to 5.0 um in average diameter in the case of a cylindrical particle, and 
 iv) optionally having fluorescence color, absorption color, interference color or a combination thereof. 
 
     
     
       22. The composition according to  claim 1  wherein the particulate optical modifier is composed predominately of platy particles further defined by having an average plate diameter of about 10 um to 200 um and a refractive index of at least about 1.8. 
     
     
       23. The composition according to  claim 1  wherein the cationic polymer is selected from cationic cellulose polymer(s), salts of hydroxyethyl cellulose reacted with trimethyl ammonium substituted epoxide, polymeric quaternary ammonium salts of hydroxyethyl cellulose reacted with lauryl dimethyl ammonium-substituted epoxide, cationic polysaccharide polymer(s), guar hydroxypropyltrimonium chloride, hydroxypropylated cationic guar derivative(s) optionally containing a low level of substituent groups and/or cationic quaternary ammonium groups, or blends thereof. 
     
     
       24. The composition according to  claim 1  wherein the particulate optical modifier contains a surface modification selected from amino acids, proteins, fatty acids, lipids, phospholipids (lecithin), anionic and/or cationic oligomers/polymers or blends or derivatives thereof to enhance the deposition of the optical modifier on to the skin. 
     
     
       25. A method of depositing a solid particulate optical modifier onto the skin from an isotropic liquid cleansing composition, comprising the steps of:
 (a) providing said solid particulate optical modifier in said cleansing composition including:
 (1) a surfactant selected from anionic, nonionic, amphoteric and cationic surfactants, and mixtures thereof; 
 (2) a thickening agent, 
 (3) about 0.2% to about 1% by weight of said solid particulate optical modifier of from about 50 to about 150 microns in average diameter, wherein the solid particulate optical modifier is selected from organic pigments, inorganic pigments, platy substrate coated with organic and inorganic materials, or blends and physical aggregates thereof; 
 (4) about 0.1% to 10% of a cationic polymer; and 
 (5) less than 0.01% of a hydrophobic emollient; 
 
 (b) applying said cleansing composition to the skin or hair; and 
 (c) rinsing off said cleansing composition.